linux-kernel - Re: [PATCH v4 2/2] arm64: dts: rockchip: Add rk3576 evb2 board

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Message-ID: <b61182f9-36ca-40c6-aaf7-ae7d21698285@lunn.ch>
Date: Thu, 22 Jan 2026 03:39:17 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Chaoyi Chen <chaoyi.chen@...k-chips.com>
Cc: Chaoyi Chen <kernel@...kyi.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Quentin Schulz <quentin.schulz@...rry.de>,
	Jonas Karlman <jonas@...boo.se>, Hsun Lai <i@...insx.cn>,
	John Clark <inindev@...il.com>, Jimmy Hon <honyuenkwun@...il.com>,
	Dragan Simic <dsimic@...jaro.org>,
	Michael Riesch <michael.riesch@...labora.com>,
	Peter Robinson <pbrobinson@...il.com>,
	Alexey Charkov <alchark@...il.com>,
	Shawn Lin <shawn.lin@...k-chips.com>,
	Sebastian Reichel <sebastian.reichel@...labora.com>,
	Andy Yan <andy.yan@...k-chips.com>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] arm64: dts: rockchip: Add rk3576 evb2 board

On Thu, Jan 22, 2026 at 09:41:19AM +0800, Chaoyi Chen wrote:
> Hi Andrew,
> 
> On 1/21/2026 9:15 PM, Andrew Lunn wrote:
> >> +&mdio0 {
> >> +	rgmii_phy0: ethernet-phy@1 {
> >> +		compatible = "ethernet-phy-ieee802.3-c22";
> >> +		reg = <0x1>;
> >> +		pinctrl-names = "default";
> >> +		pinctrl-0 = <&rgmii_phy0_rst>;
> >> +		reset-assert-us = <20000>;
> >> +		reset-deassert-us = <100000>;
> >> +		reset-gpios = <&gpio3 RK_PD3 GPIO_ACTIVE_LOW>;
> >> +		tx-internal-delay-ps = <1900>;
> > 
> > What PHY is this? Does it actually implement this property?
> > 
> > It is also close to the 2000ps default. Have you put the board in an
> > environment chamber and run tests at -20C to +70C to see if it will
> > work with the default 2000ps?
> >
> 
> It is MotorComm yt8xxx PHY. I chose 1950 here because I find that
> the MotorComm PHY binding only offer the options of 1950 or 2100. 

Without the property it should default to something near to 2000. Most
MAC/PHY pairs should work without this property, if the board is
designed correctly. So i suggest you only have a tx-internal-delay-ps
if it is required.

   Andrew